Suppression of Atomic Radiative Collisions by Tuning the Ground State Scattering Length
نویسندگان
چکیده
We investigate the radiative collision rate in an ultracold, optically trapped cesium gas near a magnetically tunable Feshbach resonance. The radiative trap loss is suppressed by a factor of up to 15 when the node of the ground state pair correlation function is tuned to the Condon point. This constitutes a direct measurement of both the sign and the magnitude of the s-wave scattering length. In addition, we observe several narrow, superimposed loss resonances. Their widths are determined by the gas temperature, and their positions are independent of external parameters to within 5 mG.
منابع مشابه
Feshbach Resonance and Hybrid Atomic/Molecular BEC-Systems
The interactions responsible for Feshbach resonances in binary atom collisions produce a condensate of molecules in the atomic BEC-system. We discuss the ‘ground state’ of the condensate system and illustrate that its properties differ quantitatively and qualitatively from the properties of a single condensate with atom-atom interactions described by the effective scattering length that charact...
متن کامل0 Tuning the scattering length on the ground triplet state of Cs
We develop two schemes for tuning the scattering length on the ground triplet state of Cs 2. First, an absolute value of the triplet scattering length of 133 Cs 2 is determined using the experimental data (Fioretti et al, Eur.Phys.J. 5, 389 (1999)). Then, we demonstrate that the large scattering length can be made small and positive by coupling of the 3 Σ + u (6S + 6S) potential to the 3 Π g st...
متن کاملOptical Feshbach Resonances in a Bose-Einstein Condensate
This thesis reports on the first observation of optical tuning of interactions in an ultracold atomic gas. To control the elastic interactions, we use optically induced scattering resonances. They are realized by coupling pairs of atoms to a bound molecular state with the help of laser light. In comparison to the well-known magnetic Feshbach resonances, these optical Feshbach resonances allow a...
متن کاملDetermination of the calcium ground state scattering length by photoassociation spectroscopy at large detunings
Photoassociation spectroscopy was used to determine the s-wave scattering length of Ca atoms in their electronic ground state. Vibrational levels were observed in an extended range of up to 182 GHz below the dissociation limit 4s S0–4s4p P1. Thus, the frequency interval was nearly tripled, in which photoassociation was observed compared to previous measurements. The spectra were analyzed by mea...
متن کاملEffects of Temperature on Radiative Properties of Nanoscale Multilayer with Coherent Formulation in Visible Wavelengths
During the past two decades, there have been tremendous developments in near-field imaging and local probing techniques. Examples are the Scanning Tunneling Microscope (STM), Atomic Force Microscope (AFM), Near-field Scanning Optical Microscope (NSOM), Photon Scanning Tunneling Microscope (PSTM), and Scanning Thermal Microscope (SThM).Results showed that the average reflectance for a dopant con...
متن کامل